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Full text of "Alexander von Humboldt"

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138                                LIFE OF
The work abounds in important results, and includes
a chart of Central Asia, drawn by Humboldt himself,
which is prepared entirely according to the latest
astronomic and altitude measurements. The calcula-
tion of the astronomical observations made for this
purpose, in Siberia, was the last work of Humboldt's
constant fellow-worker, Oltmann, who died soon after
the completion of this task.